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https://www.readbyqxmd.com/read/28934673/an-analysis-of-chemicals-and-other-constituents-found-in-produced-water-from-hydraulically-fractured-wells-in-california-and-the-challenges-for-wastewater-management
#1
Emily A Chittick, Tanja Srebotnjak
As high-volume hydraulic fracturing (HF) has grown substantially in the United States over the past decade, so has the volume of produced water (PW), i.e., briny water brought to the surface as a byproduct of oil and gas production. According to a recent study (Groundwater Protection Council, 2015), more than 21 billion barrels of PW were generated in 2012. In addition to being high in TDS, PW may contain hydrocarbons, PAH, alkylphenols, naturally occurring radioactive material (NORM), metals, and other organic and inorganic substances...
September 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28932708/intracellular-trafficking-pathways-of-edwardsiella-tarda-from-clathrin-and-caveolin-mediated-endocytosis-to-endosome-and-lysosome
#2
Zhi-Hai Sui, Haijiao Xu, Hongda Wang, Shuai Jiang, Heng Chi, Li Sun
Edwardsiella tarda is a Gram-negative bacterium that can infect a broad range of hosts including humans and fish. Accumulating evidences have indicated that E. tarda is able to survive and replicate in host phagocytes. However, the pathways involved in the intracellular infection of E. tarda are unclear. In this study, we examined the entry and endocytic trafficking of E. tarda in the mouse macrophage cell line RAW264.7. We found that E. tarda entered RAW264.7 and multiplied intracellularly in a robust manner...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28931832/mediating-role-of-trpv1-ion-channels-in-the-co-exposure-to-pm2-5-and-formaldehyde-of-balb-c-mice-asthma-model
#3
Jing Song, Jun Kang, Bencheng Lin, Jinquan Li, Yuqing Zhu, Junting Du, Xu Yang, Zhuge Xi, Rui Li
Asthma is a complex pulmonary inflammatory disease that can be promoted by air pollutants such as PM2.5 and formaldehyde (FA). However, existent experimental evidence principally focuses on the negative influence of a single air pollutant, neglecting the possible synergistic effect in biological responses to mixture of these pollutants, a more common situation in our daily life. In this study, allergic Balb/c mice were exposed to a mixture of PM2.5 and FA, and their toxicological effects and mechanisms were explored...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928940/comparison-of-color-discrimination-in-chronic-heavy-smokers-and-healthy-subjects
#4
Thiago Monteiro de Paiva Fernandes, Natanael Antonio Dos Santos
Background: Cigarette smoke is probably the most significant source of exposure to toxic chemicals for humans, involving health-damaging components, such as nicotine, hydrogen cyanide and formaldehyde. The aim of the present study was to assess the influence of chronic heavy smoking on color discrimination (CD). Methods: All subjects were free of any neuropsychiatric disorder, identifiable ocular disease and had normal acuity. No abnormalities were detected in the fundoscopic examination and in the optical coherence tomography exam...
2017: F1000Research
https://www.readbyqxmd.com/read/28922882/microsurgical-anatomy-of-the-interfascial-vein-its-significance-in-the-interfascial-dissection-of-the-pterional-approach
#5
Alvaro Campero, Pablo Ajler, Martín Paíz, Ramiro López Elizalde
BACKGROUND: The pterional approach (PA), together with its variants, is still one of the most common methods used by surgeons to reach the anterior and middle cranial base. A highly important technical detail during a PA is the preservation of the frontotemporal branch of the facial nerve, which can be achieved through an interfascial dissection. OBJECTIVE: To describe the anatomy of the interfascial vein (IFV), highlighting its recognition as a significant anatomic reference to perform an interfascial dissection (IFD)...
October 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28921510/development-of-a-formaldehyde-biosensor-with-application-to-synthetic-methylotrophy
#6
Benjamin M Woolston, Timothy Roth, Ishwar Kohale, David Liu, Gregory Stephanopoulos
Formaldehyde is a prevalent environmental toxin and a key intermediate in single carbon metabolism. The ability to monitor formaldehyde concentration is therefore of interest for both environmental monitoring and for metabolic engineering of native and synthetic methylotrophs, but current methods suffer from low sensitivity, complex workflows, or require expensive analytical equipment. Here we develop a formaldehyde biosensor based on the FrmR repressor protein and cognate promoter of E. coli. Optimization of the native repressor binding site and regulatory architecture enabled detection at levels as low as 1 µM...
September 16, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28918071/the-masseteric-nerve-an-anatomical-study-in-thai-population-with-an-emphasis-on-its-use-in-facial-reanimation
#7
Apichai Angspatt, Chirayu Pannanusorn
BACKGROUND: The use of the masseteric nerve has been escalated as a donor nerve for facial reanimation in facial palsy patient (Wang et al., 2014; Manktelow et al., 2006; Klebuc, 2011; Bianchi et al., 2012; Zuker et al., 2000; Bae et al., 2006; Terzis, Konofaos, 2013; Terzis, Olivares, 2009; Bianchi et al., 2014). Previous studies had been done in Euro-Caucasian cadavers (Kaya et al., 2014). However, difference in anatomical details does exist between Asian and Euro-Caucasian population (Tzou et al...
September 13, 2017: Asian Journal of Surgery
https://www.readbyqxmd.com/read/28917912/a-plant-based-reactive-ammonium-phytate-for-use-as-a-flame-retardant-for-cotton-fabric
#8
Yajuan Feng, Yang Zhou, Daikun Li, Shuai He, Fengxiu Zhang, Guangxian Zhang
A plant-based non-formaldehyde flame retardant containing high phosphorus ammonium phytate (APA) was synthesized for cotton fabric. The char length of treated cotton sample decreased to 31mm from the original 300mm. The LOI value of finished cotton fabric was as high as 43.2%, and after 30 laundering cycles, it still remained 30.5%, suggesting that APA could be used as an effective semi-durable flame retardant. The TG analysis in air demonstrated that the thermal oxidation stability of treated fabric was significantly improved...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917166/omi-satellite-observed-formaldehyde-column-from-2006-to-2015-over-xishuangbanna-southwest-china-and-validation-using-ground-based-zenith-sky-doas
#9
Rui Liu, Tao Feng, Shanshan Wang, Chanzhen Shi, Yanlin Guo, Jialiang Nan, Yun Deng, Bin Zhou
Formaldehyde (HCHO) provides a proxy to reveal the isoprene and biogenic volatile organic compounds emission which plays important roles in atmospheric chemical process and climate change. The ground-based observation with zenith-sky DOAS is carried out in order to validate the HCHO columns from OMI. It has a good correlation of 0.71678 between the HCHO columns from two sources. Then we use the OMI HCHO columns from January 2006 to December 2015 to indicate the interannual variation and spatial distribution in Xishuangbanna...
September 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28916762/time-resolved-analysis-of-dna-protein-interactions-in-living-cells-by-uv-laser-pulses
#10
Angela Nebbioso, Rosaria Benedetti, Mariarosaria Conte, Vincenzo Carafa, Floriana De Bellis, Jani Shaik, Filomena Matarese, Bartolomeo Della Ventura, Felice Gesuele, Raffaele Velotta, Joost H A Martens, Hendrik G Stunnenberg, Carlo Altucci, Lucia Altucci
Interactions between DNA and proteins are mainly studied through chemical procedures involving bi-functional reagents, mostly formaldehyde. Chromatin immunoprecipitation is used to identify the binding between transcription factors (TFs) and chromatin, and to evaluate the occurrence and impact of histone/DNA modifications. The current bottleneck in probing DNA-protein interactions using these approaches is caused by the fact that chemical crosslinkers do not discriminate direct and indirect bindings or short-lived chromatin occupancy...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916131/chemical-exposures-in-recently-renovated-low-income-housing-influence-of-building-materials-and-occupant-activities
#11
Robin E Dodson, Julia O Udesky, Meryl D Colton, Martha McCauley, David E Camann, Alice Y Yau, Gary Adamkiewicz, Ruthann A Rudel
Health disparities in low-income communities may be linked to residential exposures to chemicals infiltrating from the outdoors and characteristics of and sources in the home. Indoor sources comprise those introduced by the occupant as well as releases from building materials. To examine the impact of renovation on indoor pollutants levels and to classify chemicals by predominant indoor sources, we collected indoor air and surface wipes from newly renovated "green" low-income housing units in Boston before and after occupancy...
August 14, 2017: Environment International
https://www.readbyqxmd.com/read/28915384/supramolecular-nano-sniffers-for-ultrasensitive-detection-of-formaldehyde
#12
Uchangi Satyaprasad Akshath, Praveena Bhatt
Supramolecular nanoparticle hybrids for biosensing of analytes have been a major focus due to their tunable optical and surface properties. Quantum dots-Gold nanoparticle (QDs-GNP) based FRET probes involving turn on/off principles have gained immense interest due to their specificity and sensitivity. Recent focus is on applying these supramolecular hybrids for enzyme operated biosensors that can specifically turn-on fluorescence induced by co-factor or product formed from enzymatic reaction. The present study focuses on locking and unlocking the interaction between QD-GNP pair leading to differential fluorescent properties...
September 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28914524/templated-and-catalytic-fabrication-of-n-doped-hierarchical-porous-carbon-carbon-nanotubes-hybrids-as-host-for-lithium-sulfur-batteries
#13
Junjie Cai, Chun Wu, Shaoran Yang, Ying Zhu, Pei Kang Shen, Kaili Zhang
Nitrogen-doped hierarchical porous carbon and carbon nanotube hybrids (N-HPC-CNTs) are fabricated by simple pyrolysis of the N-rich raw material melamine-formaldehyde (MF) resin in the presence of nano-CaCO3 and bimetallic combination of Fe-Co catalyst. During carbonization, nano-CaCO3 acts as template for creating a hierarchical porous carbon and the N atoms originated from MF resin are in-situ doped into the carbon matrix simultaneously. Meanwhile, volatile gases generated by the thermal decomposition of MF resin could serve as carbon and nitrogen sources to grow nitrogen doped CNTs on HPC...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28912714/anti-inflammatory-and-analgesic-effects-of-polygonum-orientale-l-extracts
#14
Kai-Jun Gou, Rui Zeng, Yan Dong, Qi-Qi Hu, Huang-Wan-Yin Hu, Katherine G Maffucci, Qi-Ling Dou, Qing-Bo Yang, Xu-Hua Qin, Yan Qu
Background and Purpose:Polygonum orientale L. (family: Polygonaceae), named Hongcao in China, is a Traditional Chinese Medicinal and has long been used for rheumatic arthralgia and rheumatoid arthritis. However, no pharmacological and mechanism study to confirm these clinic effects have been published. In this investigation, the anti-inflammatory, analgesic effects and representative active ingredient compounds of P. orientale have been studied. Methods: Dried small pieces of the stems and leaves of P. orientale were decocted with water and partitioned successively to obtain ethyl acetate and ethyl ether extract of P...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28906042/vascular-configurations-of-anastomotic-basket-of-conus-medullaris-in-human-spinal-cord
#15
Santiago Rojas, Marisa Ortega, Alfonso Rodríguez-Baeza
INTRODUCTION: The arterial basket of the conus medullaris is one of several anastomoses between the anterior and posterior spinal arteries. The anatomy of this structure has attracted little attention. This work sought to investigate its configuration in human spinal cords. MATERIALS AND METHODS: Spinal cords from male and female cadavers (n=32) were injected with colored latex through the intercostal, lumbar, medial sacral and the posterior trunks of the hypogastric arteries...
September 14, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28902038/removal-of-hazardous-surgical-smoke-using-a-built-in-filter-trocar-a-study-in-laparoscopic-rectal-resection
#16
Koo Yong Hahn, Dong Woo Kang, Zairul Azwan Mohd Azman, Se-Young Kim, Seon-Hahn Kim
BACKGROUND: Surgical smoke containing potentially carcinogenic and harmful materials is an inevitable consequence of surgical energy devices, and constitutes a substantial occupational hazard in the operating room. This study aimed to evaluate the efficacy of a built-in-filter trocar in eliminating hazardous surgical smoke during laparoscopic and robotic rectal surgery. METHODS: Ten patients who underwent rectal cancer resection were enrolled. Five patients underwent surgery utilizing a nonfiltered trocar, and the remaining 5 utilized a built-in-filter trocar...
September 8, 2017: Surgical Laparoscopy, Endoscopy & Percutaneous Techniques
https://www.readbyqxmd.com/read/28895434/genetic-variation-and-risk-of-dna-damage-in-peripheral-blood-lymphocytes-of-iranian-formaldehyde-exposed-workers
#17
Rezvan Zendehdel, Parviz Abdolmaleki, Fatemeh Javani Jouni, Mohammad Mazinani
Formaldehyde (FA) has given positive results for the genetic damage evaluated in human peripheral blood lymphocytes. Polymorphism plays a special role in the toxicity of chemicals. DNA damage in blood cells was evaluated in workers who were occupationally exposed to FA. This study tested the association of alcohol dehydrogenase III (ADH3) and manganese-superoxide dismutase (Mn-SOD) gene polymorphism, with DNA damage of peripheral blood lymphocytes. Gene polymorphisms were evaluated in 54 workers from melamine dinnerware workshops and 34 workers from dairy production workshops...
January 1, 2017: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/28891347/synthesis-and-biological-evaluation-of-aminomethyl-and-alkoxymethyl-derivatives-as-carbonic-anhydrase-acetylcholinesterase-and-butyrylcholinesterase-inhibitors
#18
İlhami Gulçin, Malahat Abbasova, Parham Taslimi, Zübeyir Huyut, Leyla Safarova, Afsun Sujayev, Vagif Farzaliyev, Şükrü Beydemir, Saleh H Alwasel, Claudiu T Supuran
Compounds containing nitrogen and sulfur atoms can be widely used in various fields such as industry, medicine, biotechnology and chemical technology. Therefore, the reactions of aminomethylation and alkoxymethylation of mercaptobenzothiazole, mercaptobenzoxazole and 2-aminothiazole were developed. Additionally, the alkoxymethyl derivatives of mercaptobenzoxazole and 2-aminothiazole were synthesized by a reaction with hemiformals, which are prepared by the reaction of alcohols and formaldehyde. In this study, the inhibitory effects of these molecules were investigated against acetylcholinesterase (AChE), butyrylcholinesterase (BChE) enzymes and carbonic anhydrase I, and II isoenzymes (hCA I and II)...
December 2017: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/28890353/identifying-principles-for-effective-messages-about-chemicals-in-cigarette-smoke
#19
Seth M Noar, Dannielle E Kelley, Marcella H Boynton, Jennifer C Morgan, Marissa G Hall, Jennifer R Mendel, Kurt M Ribisl, Noel T Brewer
US law requires the Food and Drug Administration (FDA) to disclose information on harmful and potentially harmful chemicals in cigarette smoke (i.e., constituents) to the public. To inform this effort, we sought to identify principles for creating constituent messages that effectively discourage smoking. Participants were an online convenience sample of 1148 US smokers ages 18+. We developed a library of 76 messages about constituents only and constituents plus contextualizing information (i.e., toxic products that also contain the chemical, health effects, or both)...
September 7, 2017: Preventive Medicine
https://www.readbyqxmd.com/read/28889150/screening-for-skin-sensitizing-allergens-among-patients-with-clinically-suspected-allergic-contact-dermatitis
#20
Zahid Shakoor, Ahlam S Al-Mutairi, Afnan M Al-Shenaifi, Areej M Al-Abdulsalam, Bashayer Z Al-Shirah, Shahad A Al-Harbi
To detect common skin-sensitizing agents among patients experiencing allergic contact dermatitis (ACD). Methods: This was a retrospective study of 152 patients with clinically suspected ACD who underwent patch testing in an allergy clinic at King Khalid University Hospital, Riyadh, Kingdom of Saudi Arabia between January 2012 and February 2015. Of these patients, only 74 (48%) patients reacted to one or more contact allergens. This group of patients included 58 (78.4%) women and 16 (21.6%) men (mean age: 37...
September 2017: Saudi Medical Journal
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